Explosive-engine.



PATENTED AUG.'13,"190'7.' DET.

lNb. 863,142.

L. BOUDREAUX & L. VER

EXPLOSIVE ENGINE. APPLIOATION FILED 313.24, 1906.

a Ballard-sum- 1.

No. 863,142. PATENTED AUG. 13, 1907.

BOUDREAUX & L. VERDET.

EXPLOSIVE ENGINE. APPLIIOATION 3mm 1-33.34, 1906.

IIII' PATENTED AUG. 13; 1907. L. BOUDREAUX & L. VERDET.

BXPLOSIVE ENGINE. APPLICATION FILED r33. 24, 1900.

3 SHEETS-SHEET 8- 1 UNITED? STATES PATENT ossron.

LOUIS BQUDREAUX AND LOUIS VElitDET, OF PARIS, FRANCE.

EXPLOSIVE-ENGINE.

Application filed February 24,

To all whom it may concern:

Be it known that we, LOUIS Bounsnaux and LOUIS VERDET, citizens of the French Republic, residing at Paris, in France, have invented certain new and use- 5 ful Improvements in Explosion-Engines, of which the following is a specification. I

This invention relates to improvements in explosion engines with differential pistons arranged and working in common cylinders, .for the purpose of increasing the efficiency of these engines, while pteserving the great advantages that they have over ordinary engines with separate cylinders. v

The reasons for which the annular cylinder charge of an engine with differential piston of well known constructions, does not give, with equal surfaces, at thermal efficiency as high as the efficiency of a cylinder charge of an engine with separate pistons, are as followsz-In an engine with differential piston of well known construction, the chamber for the explosion of the annular cylinder charge comprises two portions: "a gaseous mass compressed in the valve chest, and an annular space formed round the portion of small diameter of the piston when the latter is at the end of its stroke. The result is that the ignition of the gases compressed in these twospaces, requires time proportional to the distance separating the point at which the said ignition takes place, from the diametrically opposite point of the annular space, sothat this ignition takes place slowly. These drawbacks do not exist in a compression chamber of ordinary cylinder, in which the spaces are more compact, and in which the mass of compressed gases is less spread out.

This invention has for its object to avoid these drawbacks inherent to the well known engines with differential pistons by employing the construction illusstated in the accompanying drawings and described hereinafter. This arrangement is shown, by way of example, in the accompanying drawing, in which 2-- Figure 1 shows an engine comprising the said device, in verticalsectionalong an oblique plane relatively to the axis, that is to say on line A-A of Fig. 2 which is a horizontal cross-section of the said engine on line B-B of Fig. 1. Fig. 3 is another vertical section on line 0-0 s of Fig. 2. Fig. 4 is a horizontal cross-section on line f5 D D of Fig. .3. Fig. 5 is an elevation partly in section ,showing the means for operating the inlet and exhaust valves. Fig. 6 is a side elevation of Fig. 5.-

According to this invention, thetwo operative faces 7 a b of the differential piston (a the circular and b the annular face) at the end of the compression and exhaust stroke, come nearly in contact with the corresponding Specification of Letters Patent.

box p fixed on the gear-case of the motor.

Patented Aug. 13, 1907.

190a. SerialNo-302fl37- ends of the two portions 0 d of the cylinder. The explosion chambers of each of the cylindrical portions 0 d are constituted by a suitable number of spaces e e and ff, opening-into the said portions through openings 9 and h of suitable cross-section. These spaces e e and ff are each provided with an ignition device 0 and controlled by the suction valves 1' j and exhaust valves k 1. Owing to this arrangement, when the compression is complete, the entire charge of gas is forced into each of the chambers e e and f7, so that at the moment of ignition, the' gaseous masses, confined in thesev chambers, explode in the minimum of time and with the maximum of energy. It will be sufficient therefore to give to the engine, according to its speed of rotation, the lead required for the total ignitionmf the gaseous masses, in order that the said ignition should take place at the moment when the piston arrives at the end of its stroke. Immediately after the explosion, the piston continuing its stroke, the gases expand on each of the operativefaces ofthe differover, it must be pointed out that, by dividing the explosion chamber intoa more. or less great number of equidistant chambers, each provided with an ignition device, a more normal distribution of the forces on each' of the operative faces of the differential piston is obtained. This-division or distribution of the explosion chamber into several equidistant'and compact chambers, also enables the ignition speed to be'accelerated by reducing the distance to he traveled by the flame.

The controlling gear for the admissionand exhaust valves, arranged respectively oneach side of the motor, can be of any suitable kind as for example that represented in Figs. 5 and 6.

According to this arrangement, for each group of valves 71, j, or 70, Z, there is arranged around a half-speed shaftn, a frame m moving vertically in the slides of a m carries two rollers q arranged one on either side of the shaft n, and adapted to come into contact with a cam r or s on said shaft. The frame m carries a rod a; suitably. guided in a bearing t and provided above and below this bearing with tappets u and b. When the cams 1' and 3 act respectively on the corresponding frames m to cause them to rise, the lower tappets u operate the rods of the valves of the cylinder of small diameter, while, when thecarns r and s cause the frames m to descenehthe up-. per tappets 1) act on the rods of the valves of the cylinder of large diameter. .The tappets u and 'v on each rod :1 are arranged in such a manner as normally not to touch the rods of the two valves, so that these remain closed the shaft 1.

What we claim as our invention and desire to secure by Letters Patent is 10' inder, and the others in communication with the larger I portion of the cylinder, said explosion chambers opening into the cylinder at points immediately above the faces of thepiston when the latter is at the end of its in-stroke, and an ignition device arranged in each explosion chamber.

In testimony whereof we have signed our names to this 15 specification in the presence of two subscribing witnesses.

LOUIS BOUDRIGAUX. LOUIS VERDICT. Witnesses: HANSON C. Coxn,

Gnonous BONNnUIL. 

